The motion sensors tell the hub if they detect movement around by sending alerts to your smart device, sounding an alarm or activating other Smart home devices, As well as detecting intruders and potentially activating alarm sirens or cameras, smart home motion sensors can be used to set up a range of useful home automation effects. For instance a triggered motion sensor on the stairs could switch on a light connected to a smart plug in the downstairs hall. You can adjust the motion Sensor's sensitivity too so that it's not accidentally triggered by family pets. The sensor can be wall mounted. This requires a Smart KX-HNB600W Hub to function.